Threads like this are all over. Numbers are very subjective and in my opinion, rarely concretely talked about. What is a good number for one is a horrible number for another.

What is important is setting your own numbers that you would like to reach. Set a reasonable number and then dream of what you really want to achieve.

Be sure you have Google Analytics installed.

If you are interested in working on campaigns, numbers totally depend upon what the specific company is looking for. Above all else, write great content and stay true to yourself. Always be honest about your numbers when asked. It is never worth selling yourself out just to increase a number. You will get there. I'm still working and dreaming on mine.

It really depends on your goals. Sometimes traffic can come overnight if you have a media interview or something. Other times it takes a little while, There are some tips that will help I have a bunch of free traffic posts on my blog to help you.

Some get 10,000 visitors a month and up, some only 100. Depends on a lot of factors. Don't get discouraged just keep writing the traffic will come :)